Carrier billing lets you buy apps, games, or subscriptions and have the cost...

https://stephenczub458.theglensecret.com/what-is-direct-carrier-billing-and-how-is-it-different

Carrier billing lets you buy apps, games, or subscriptions and have the cost added to your monthly phone bill or taken from your prepaid credit. It’s a simple way to pay without entering card details, making small purchases easier on your phone.